苏里格气田不同组合类型的复合砂体水平井采出程度研究

Study on recovery efficiency of horizontal well for different type combinations of compound sand body in Sulige gas field

苏里格气田现有直井产能低、整个区块开发效率差,水平井开发是提高气田采出程度的有效方法。然而,水平井在不同砂组中布署的适应性问题尚不明确。本文依据沉积成因分析,剖面储量集中度分布特征,建立了三种砂体组合类型,即厚层块状孤立型、多期垂向叠置泛连通型和多期分散局部连通型。通过对不同类型砂组开展地质建模、数值模拟研究,分析了各自情形下水平井储量动用的程度。研究表明,厚层块状孤立型、多期垂向叠置泛连通型复合砂体采用水平井开发比直井开发采出程度可提高10%-15%,而多期分散局部连通型复合砂体则更适应采用直井开发。

Sulige gas field faces the problems of low production capacity and poor development efficiency. The use of horizontal wells is an effective way to improve gas field recovery degree. However, the adaptability problem of horizontal wells in different sand group is not clear yet. Based on the analysis of sedimentary origin and the concentration distribution of profile reserves, this article establishes three types of sand group, namely thick massive isolated type, multi--stage vertical overlay connected type and multi--stage dispersed local connectivity type. Through geological modeling and numerical simulation for different kinds of sand group, the article analyzes the increase degree of producing reserves by horizontal wells in different situation. Studies have shown that if using horizontal well, recovery degree of thick massive isolated type and multi- stage vertical overlay connected type of compound sand body can be increased by 10%-15%, and multi--stage dispersed local connectivity type of compound sand body is more adapt to the development of vertical wells.